Multi-stage U-shaped gas-coupled pulse tube refrigerator connected-tube heat exchanger and its realization method

Abstract

The invention discloses a tube-connected heat exchanger for a multi-stage U-shaped gas-coupling pulse tube refrigerator and a method for realizing the same. The cold-end heat exchanger comprises a heat exchanger shell, a connecting tube, a conical slit body, a The first through hole, the laminar flow element, the second conical slit body, and the second through hole. Conical slits are cut on the left and right sides of the heat exchanger shell respectively, and the two parts are connected by welding connecting pipes, and the connection of the first-stage regenerator, the second-stage regenerator and the first-stage pulse tube is realized at the same time. The invention maintains the advantages of high-efficiency heat exchange of traditional heat exchangers, and realizes high-efficiency matching between the front and rear stage cooling fingers of the pulse tube refrigerator, suppresses the backflow, mixed flow and turbulent disturbance of the gas working medium in the heat exchange channel, and ensures the uniformity of gas flow. sex. The invention will significantly improve the heat exchange efficiency and overall performance of the pulse tube refrigerator, and has very positive significance in realizing the compactness and practicality of the multi-stage pulse tube refrigerator and obtaining extremely low temperature.

Description

technical field [0001] The invention belongs to the field of refrigeration and cryogenic engineering, relates to a pulse tube refrigerator, and in particular relates to a multi-stage U-shaped gas-coupled pulse tube refrigerator connected-tube cold-end heat exchanger and a realization method thereof. Background technique [0002] The pulse tube refrigerator is a major innovation to the regenerative low temperature refrigerator. It cancels the moving parts of the conventional regenerative refrigerator in the low temperature area. It has high reliability, small mechanical vibration, long working life, high refrigeration efficiency, The outstanding advantages such as low electromagnetic noise are recognized as a new generation of long-life regenerative cryogenic refrigerators, which have been widely used in aerospace, cryogenic electronics, superconducting industry and cryogenic medical industry. [0003] According to the relationship between the regenerator and the pulse tube, ...

AI Technical Summary

Problems solved by technology

For the U-shaped arrangement of cold fingers, there is also a pressure loss caused by the flow direction of the gas working medium being reversed by 180°, which requires a coherent and compact flow channel structure to reduce the void volume and flow loss

[0010] At present, the cold-end heat exchanger of the conventional multi-stage U-shaped gas-coupled pulse tube refrigerator is far from meeting these requirements, and there are still large gaps in related technologies.

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